how to download OS X Lion from apple store?

I purchased a few months ago family pack OS X Lion from apple store, and i need to download it on my last upgraded machine (iMac 5.1). But when I go on apple apps store, it only offers the OS X Mountain lion which i need to purchase again.

Once you're in the App Store look on the right side of the App Store screen. You should see Account, Redeem, etc. Click Account and if you're not already logged in, you should be prompted for your Apple ID and password or just your password if your Apple ID is already populated.

Yes you can - as long as it's on/for a Mac you own and control. By the way, that license is not transferable, so if/when you sell a Mac that you purchased Lion for, you will need to uninstall it and reinstall the original system.

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